Cement flint clay brick for metallurgical and other purposes.



UNITED sTATEs PATENT omnon.

CHARLES E. POPE, OF PITTSBURG, PENNSYLVANIA.

CEMENT FLINT CI AY BRICK FOR METALLURGICAL AND OTHER PURPOSES.

No Drawing.

Specification of Letters Patent. Patented D ec. 2S, 1909. Application fl1ed September 17, 1908. Serial No. 453,497. i

To all whom it may concern:

Be it known that I, CHARLES E. Porn, a citizen of the United States, residing at Pittsburg, Pennsylvania, have invented certain new and useful Improvements in Gement Flint Clay Brick for Metallurgical and other Uses, of which the following is a specification.

The object of the invention is to produce bond of Portland cement.

Owing to the higher heats and increased friction which are now common, many of the types of flint clay bricks, and other fire bricks which were formerly adequate for their respective intended uses are no longer able to satisfactorily stand the heats and the friction combined with the chemical attack of the gases, slags, and other agencies to which they are subjected in many furnaces and also in many flues and other places where similar materials refractory not only to heat but to friction and attendant agencies are required. The shrinkage in making bricks composed largely of alumina and the expansion and contraction in compositions largely of silica, add to the great practical difficulties of producing and firing satisfactory bricks for such uses.

Unground cement clinker nodules, pref-.

erably broken into fragments so as to present angular edges, and broken flint clay brick bats, or burnt flint clay brick material bonded together with suflicient Portland cement, make a cheap and economical refractory brick which, while readily withstanding high temperatures as high as 2500 F., are also highly resistant to the wear and tear due to excessive friction, and do not suffer from warping and changes of size due to the firing of the brick after molding in the usual flint clay brick manufacture. The intimate union between the Portland cement and the cement clinker nodules and flint clay brick fragments produces a very desirable composite brick.

In preparing the improved brick I prefer to take the cement clinker nodules just as they come from the rotary kiln and crush.

by means of rolls or in any other suitable way. I mix approximatelythree parts of the coarser and three. parts of the finer of each of these two materials and then bond the Whole twelve parts together with two parts of finished Portland cement, with the usual added percentage of water, forming and molding the brick in the desired forms, and then allowing it to set. The same composition may be used for repairing or making linings while it is inplastic condition,

.as will be well understood. The percentages given may be varied to suit considerablevariations in sizes of the bats and cement clinker fragments, following principles well understood in making concretes. The proportions I have stated are those which are very satisfactory under average conditions.

This composite brick combines cheapness,

refractory qualities, and the advantage of contracting or warping very much less when subjected to high temperatures than 'fiint clay brick.

What I claim and desire to secure by patent is:

1. Refractory brick composed of approximately three parts coarse cement clinker nodules, three parts relatively fine nodules,

\ three parts coarse flint clay brick, three parts 4. Refractory brick comprising cement fine flint clay brick, and a bond of two parts .clinker nodules and flint clay brick bonded Portland cement. with Portland cement. I

2. Refractory brick composed of approxi- In testimony whereof I have signed this 15 5 mately equal parts of cement clinker nodules specification in the presence of two subscriband flint clay brick bonded together with ing witnesses. Portland cement.

3. Refractory brick comprising sharp broken cement clinker nodules and flint clay Witnesses:

10 brick fragments bonded with Portland ce- JAMES S. DOUTHITT,

ment. WM. F. BILLINGER, Jr.

CHARLES POPE. 

